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[3.6] closes bpo-34501: PyType_FromSpecWithBases: Check spec->name before dereferencing it. (GH-8930) #8932

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Merged
miss-islington merged 1 commit into from
Aug 25, 2018
Merged

[3.6] closes bpo-34501: PyType_FromSpecWithBases: Check spec->name before dereferencing it. (GH-8930) #8932

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13 changes: 9 additions & 4 deletions 13 Objects/typeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2748,15 +2748,22 @@ PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
char *res_start = (char*)res;
PyType_Slot *slot;

if (res == NULL)
return NULL;

if (spec->name == NULL) {
PyErr_SetString(PyExc_SystemError,
"Type spec does not define the name field.");
goto fail;
}

/* Set the type name and qualname */
s = strrchr(spec->name, '.');
if (s == NULL)
s = (char*)spec->name;
else
s++;

if (res == NULL)
return NULL;
type = &res->ht_type;
/* The flags must be initialized early, before the GC traverses us */
type->tp_flags = spec->flags | Py_TPFLAGS_HEAPTYPE;
Expand All @@ -2766,8 +2773,6 @@ PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
res->ht_qualname = res->ht_name;
Py_INCREF(res->ht_qualname);
type->tp_name = spec->name;
if (!type->tp_name)
goto fail;

/* Adjust for empty tuple bases */
if (!bases) {
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